. Author manuscript; available in PMC: 2012 Sep 1.

Published in final edited form as: Am J Drug Alcohol Abuse. 2011 Sep;37(5):376–382. doi: 10.3109/00952990.2011.568080

Table 4.

Result for selected contrasts using the Hurdle Binomial (HB) Model. The estimates of both regressions are in terms of Odds Ratio (OR), though they would represent different events. LCL and UCL stand for lower and upper 95% confidence limits respectively. ‘s’ denotes significance and ‘Part.’ denotes the Participation covariate.

	Estimates	LCL	UCL
Hurdle Part (OR)

Male vs Female	0.910	0.293	2.832
Age^s	0.527	0.222	0.832
Time	1.010	0.931	1.089
Part. vs No Part..^s	6.308	1.388	11.227

Binomial part (OR)

Male vs Female	0.957	0.320	2.862
Age^s	0.611	0.277	0.946
Time	0.992	0.961	1.025
Part. vs No Part..^s	0.474	0.313	0.636